20669423544 has 96 divisors (see below), whose sum is σ = 69792877440. Its totient is φ = 5368680000.

The previous prime is 20669423473. The next prime is 20669423557. The reversal of 20669423544 is 44532496602.

20669423544 is a `hidden beast` number, since 2 + 0 + 6 + 69 + 42 + 3 + 544 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 20669423544.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1858582 + ... + 1869669.

It is an arithmetic number, because the mean of its divisors is an integer number (727009140).

Almost surely, 2^20669423544 is an apocalyptic number.

20669423544 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20669423544 is an abundant number, since it is smaller than the sum of its proper divisors (49123453896).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20669423544 is a wasteful number, since it uses less digits than its factorization.

20669423544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3728281 (or 3728274 counting only the distinct ones).

The product of its (nonzero) digits is 1244160, while the sum is 45.

The spelling of 20669423544 in words is "twenty billion, six hundred sixty-nine million, four hundred twenty-three thousand, five hundred forty-four".